/**
 * Ajax Queue Plugin
 * 
 * Homepage: http://jquery.com/plugins/project/ajaxqueue
 * Documentation: http://docs.jquery.com/AjaxQueue
 */

/**

<script>
$(function(){
    jQuery.ajaxQueue({
        url: "test.php",
        success: function(html){ jQuery("ul").append(html); }
    });
    jQuery.ajaxQueue({
        url: "test.php",
        success: function(html){ jQuery("ul").append(html); }
    });
    jQuery.ajaxSync({
        url: "test.php",
        success: function(html){ jQuery("ul").append("<b>"+html+"</b>"); }
    });
    jQuery.ajaxSync({
        url: "test.php",
        success: function(html){ jQuery("ul").append("<b>"+html+"</b>"); }
    });
});
</script>
<ul style="position: absolute; top: 5px; right: 5px;"></ul>

 */
/*
 * Queued Ajax requests.
 * A new Ajax request won't be started until the previous queued 
 * request has finished.
 */

/*
 * Synced Ajax requests.
 * The Ajax request will happen as soon as you call this method, but
 * the callbacks (success/error/complete) won't fire until all previous
 * synced requests have been completed.
 */


(function($) {
    
    var ajax = $.ajax;
    
    var pendingRequests = {};
    
    var synced = [];
    var syncedData = [];
    
    $.ajax = function(settings) {
        // create settings for compatibility with ajaxSetup
        settings = jQuery.extend(settings, jQuery.extend({}, jQuery.ajaxSettings, settings));
        
        var port = settings.port;
        
        switch(settings.mode) {
        case "abort": 
            if ( pendingRequests[port] ) {
                pendingRequests[port].abort();
            }
            return pendingRequests[port] = ajax.apply(this, arguments);
        case "queue": 
            var _old = settings.complete;
            settings.complete = function(){
                if ( _old )
                    _old.apply( this, arguments );
                jQuery([ajax]).dequeue("ajax" + port );;
            };
        
            jQuery([ ajax ]).queue("ajax" + port, function(){
                ajax( settings );
            });
            return;
        case "sync":
            var pos = synced.length;
    
            synced[ pos ] = {
                error: settings.error,
                success: settings.success,
                complete: settings.complete,
                done: false
            };
        
            syncedData[ pos ] = {
                error: [],
                success: [],
                complete: []
            };
        
            settings.error = function(){ syncedData[ pos ].error = arguments; };
            settings.success = function(){ syncedData[ pos ].success = arguments; };
            settings.complete = function(){
                syncedData[ pos ].complete = arguments;
                synced[ pos ].done = true;
        
                if ( pos == 0 || !synced[ pos-1 ] )
                    for ( var i = pos; i < synced.length && synced[i].done; i++ ) {
                        if ( synced[i].error ) synced[i].error.apply( jQuery, syncedData[i].error );
                        if ( synced[i].success ) synced[i].success.apply( jQuery, syncedData[i].success );
                        if ( synced[i].complete ) synced[i].complete.apply( jQuery, syncedData[i].complete );
        
                        synced[i] = null;
                        syncedData[i] = null;
                    }
            };
        }
        return ajax.apply(this, arguments);
    };
    
})(jQuery);